File:Silicon sphere for Avogadro project.jpg

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English: A 1-kg single-crystal silicon sphere for the Avogadro Project is shown above in the hands of Master Optician Achim Leistner at the Australian Centre for Precision Optics (ACPO), which is part of Australia's Commonwealth Scientific and Industrial Research Organisation (CSIRO).
ACPO's spheres are among the roundest man-made objects on Earth. (The gyroscopes of Gravity Probe B are equally round but are in orbit, not "on Earth".) If one of their Ø 93.6 mm spheres, which had an out-of-roundness of 35 nm, was scaled to the size of the Earth, its ‘continents’ would gradually rise only 2.4 meters above sea level.
Italiano: All'Australian Centre for Precision Optics (ACPO), parte del Commonwealth Scientific and Industrial Research Organisation (CSIRO) australiano, il Maestro ottico Achim Leistner tiene in mano una sfera da 1 kg per il Progetto avogadro costituita da un singolo cristallo di silicio.
Le sfere del centro ACPO sono gli oggetti più perfettamente rotondi al mondo mai prodotti dall'uomo. Se una delle sfere (dal diametro di 93.6 mm e aventi deviazione dalla sfericità di soli 35 nm) fosse ingrandita fino alla grandezza della Terra, le sue rugosità raggiungerebbero solamente i 2.4 metri dal livello del mare.
中文：图为澳洲精密光学中心的一名光学仪器专家，他手持的是国际阿伏伽德罗协作组织的一千克单晶体硅制球体。
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Autor The Commonwealth Scientific and Industrial Research Organisation of Australia
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Camera location33° 46′ 58.8″ S, 151° 09′ 03.6″ E Kartographer map based on OpenStreetMap.View this and other nearby images on: OpenStreetMapinfo

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  • 2008-01-11 22:28 Greg L 631×863×8 (462987 bytes) {{Information |Description=A 1-kg silicon sphere for the Avogadro Project in the hands of Master Optician Achim Leistner at the Australian Centre for Precision Optics (ACPO), which is part of Australia's Commonwealth Scientific and Industrial Research Org

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33°46'59"S, 151°9'4"E

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11 januar 2008

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actual16:12, 7 februar 2008Miniatura del version de 16:12, 7 februar 2008631 × 863 (452 KB)File Upload Bot (Magnus Manske) {{BotMoveToCommons|en.wikipedia}} {{Information |Description={{en|A 1-kg single-crystal silicon sphere for the Avogadro Project is shown above in the hands of Master Optician Achim Leistner at the [http://www.acpo.csiro.

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